CN107955957A - Fastening bolt surface smooth treatment technique - Google Patents
Fastening bolt surface smooth treatment technique Download PDFInfo
- Publication number
- CN107955957A CN107955957A CN201711228739.8A CN201711228739A CN107955957A CN 107955957 A CN107955957 A CN 107955957A CN 201711228739 A CN201711228739 A CN 201711228739A CN 107955957 A CN107955957 A CN 107955957A
- Authority
- CN
- China
- Prior art keywords
- fastening bolt
- bolt surface
- solution
- treatment technique
- wash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/003—Threaded pieces, e.g. bolts or nuts
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
- C25D3/24—Electroplating: Baths therefor from solutions of zinc from cyanide baths
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The present invention relates to a kind of fastening bolt surface smooth treatment technique, belong to technical field of fastening, comprise the following steps：(1) sandblasting, (2) chemical treatment, (3) first wash, (4) the pre-heat treatment, (5) pickling processes, (6) are zinc-plated, (7) second wash, (8) drying, fastening bolt produced by the present invention is not easy to get rusty, and can improve the corrosion resistance of fastening bolt.
Description
Technical field
The present invention relates to a kind of fastening bolt surface smooth treatment technique, belong to technical field of fastening.
Background technology
Fastening bolt surface is in various heat treatments, mechanical processing, transport and management process, inevitably by oxygen
Change, produce the oxide layer of thickness inequality.Fastening bolt after use, is easily got rusty, and causes dismounting difficult, serious to break
Split, cause security incident.
Existing fastening bolt process of surface treatment solves easy problem of rustiness using zinc-plated mostly, but simple using plating
Zinc technology can only solve temporary transient problem of rustiness, and for a long time, after zinc top layer comes off, fastening bolt is still got rusty.
For the screw thread of fastening bolt after preparatory processing, screw thread wing is sharp and crisp, after nut is screwed into, easily forms burr,
Cause to stop up.
For the screw thread of fastening bolt after preparatory processing, screw thread wing is sharp and crisp, after nut is screwed into, is easily destroyed and is covered in
The zinc top layer on screw thread side.
The content of the invention
The present invention provides a kind of fastening bolt surface smooth treatment technique, to solve the easy problem of rustiness of fastening bolt, into
One step, improve the corrosion resistance of fastening bolt.
In order to solve the above technical problem, the present invention provides following technical solution：
A kind of fastening bolt surface smooth treatment technique of the present invention, comprises the following steps：
(1) sandblasting：Abrasive material selects iron-sand, and particle diameter 0.3mm, is sprayed using 0.3mm abrasive materials, and injection pressure is
0.92-0.95MPa, nozzle keep the distance of 100mm, injection direction and fastening bolt surface normal to fastening bolt surface
Angle is controlled at 65 °；
(2) it is chemically treated：Fastening bolt is put into the molten of potassium pyrophosphate, sodium citrate, prodan and water mixed preparing
30min is soaked in liquid；
(3) first wash：Fastening bolt surface is rinsed with giant tank 5-8 times；
(4) the pre-heat treatment：Fastening bolt after washing is preheated to 480 DEG C, keeps the temperature 40min, then with 10 DEG C/
The speed of min is reduced to 140 DEG C, keeps the temperature 120min；
(5) pickling processes：Fastening bolt is cooled to 40 DEG C, then carries out pickling processes, the time of processing is 0.5min,
Pickling solution is made of following component by weight：12 parts of HF, HNO311 parts, 100 parts of H2O；
(6) it is zinc-plated：Fastening bolt made from step (7) is put into galvanized bath in 2min, plating solution is electroplated for cyanide
Liquid；
(7) second wash：Fastening bolt surface is rinsed with giant tank 8-10 times；
(8) dry.
Further, potassium pyrophosphate, sodium citrate, prodan and water press 1 in the step (2):1:1:200 quality
Ratio is configured to solution.
The beneficial effect that is reached of the present invention is：The present invention is first gone on the crisp screw thread side of fastening bolt by blasting craft
Remove, then and fastening bolt is chemically treated, remove oil removal, surface impurity, then and carry out the pre-heat treatment, make fastening bolt complete
Into oxidation, then and carry out pickling processes, remove fastening bolt oxide layer, in this way, being more crisp in order to further remove screw thread side
Position, and make fastening bolt surface smooth, last zinc-plated, plating solution is cyanide electroplate liquid, since (CN) belongs to severe toxicity, so environment
Protection constantly promotes to reduce cyanide and the electrogalvanizing plating of substitution cyanide to proposing stringent limitation using cyanide in electrogalvanizing
The development of liquid system, it is desirable to use low cyanogen (micro- cyanogen) electroplate liquid.After being electroplated using this technique, good product quality, particularly color plating,
Fastening bolt color is customized easy to producer, easy to the identification in assembling process, passivated rear color is kept, and the present invention is made
Fastening bolt be not easy to get rusty, and can improve the corrosion resistance of fastening bolt.
Embodiment
The preferred embodiment of the present invention is illustrated below, it will be appreciated that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment
A kind of fastening bolt surface smooth treatment technique, comprises the following steps：
(1) sandblasting：Abrasive material selects iron-sand, and particle diameter 0.3mm, is sprayed using 0.3mm abrasive materials, and injection pressure is
0.92-0.95MPa, nozzle keep the distance of 100mm, injection direction and fastening bolt surface normal to fastening bolt surface
Angle is controlled at 65 °；
(2) it is chemically treated：Fastening bolt is put into the molten of potassium pyrophosphate, sodium citrate, prodan and water mixed preparing
30min is soaked in liquid；
(3) first wash：Fastening bolt surface is rinsed with giant tank 5-8 times；
(4) the pre-heat treatment：Fastening bolt after washing is preheated to 480 DEG C, keeps the temperature 40min, then with 10 DEG C/
The speed of min is reduced to 140 DEG C, keeps the temperature 120min；
(5) pickling processes：Fastening bolt is cooled to 40 DEG C, then carries out pickling processes, the time of processing is 0.5min,
Pickling solution is made of following component by weight：12 parts of HF, HNO311 parts, 100 parts of H2O；
(6) it is zinc-plated：Fastening bolt made from step (7) is put into galvanized bath in 2min, plating solution is electroplated for cyanide
Liquid；
(7) second wash：Fastening bolt surface is rinsed with giant tank 8-10 times；
(8) dry.
Further, potassium pyrophosphate, sodium citrate, prodan and water press 1 in the step (2):1:1:200 quality
Ratio is configured to solution.
The present invention is first removed on the crisp screw thread side of fastening bolt by blasting craft, then and carries out chemistry to fastening bolt
Processing, removes oil removal, surface impurity, then and carry out the pre-heat treatment, fastening bolt is completed oxidation, then and carry out pickling processes,
Fastening bolt oxide layer is removed, in this way, being to further remove the more crisp position in screw thread side, and makes fastening bolt surface light
Sliding, last zinc-plated, plating solution is cyanide electroplate liquid, since (CN) belongs to severe toxicity, so environmental protection is to using cyaniding in electrogalvanizing
Thing proposes stringent limitation, constantly promotes to reduce cyanide and substitutes the development of cyanide electrogalvanizing bath system, it is desirable to uses
Low cyanogen (micro- cyanogen) electroplate liquid.After being electroplated using this technique, good product quality, particularly color plating, fastening bolt is customized easy to producer
Color, easy to the identification in assembling process, passivated rear color is kept.
The technique for the use that the present invention innovates, removes common finishing polish, rough polishing technique, directly elder generation's the pre-heat treatment, just
In forming oxide layer, then and pickling processes, remove removing oxide layer, complete polishing, technique is simple and does not destroy fastening bolt
Screw thread (crisp screw thread side, i.e. burr, belong to unnecessary structure, and the fastening to fastening bolt cuts little ice).
Tested many times by inventor, it is found that fastening bolt made from step (7) is put into galvanized bath in 2min, electricity
After the completion of plating, zinc coat under equal conditions, effectively can keep 2 times of number of days more.
The data recorded according to inventor, refer under the same conditions, with the fastening bolt of phase homogenous quantities in nitric acid, sulphur
Acid, hydrochloric acid are completely soaked down, and quality mitigates 25% hourage needed, to test the corrosion resistance of fastening bolt of the present invention.
Table 1 is the relevant experimental data of the invention with the traditional fastening bolt in market
As shown in Table 1, the fastening bolt after process using the present invention, corrosion resistance are more preferable.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To modify to the technical solution described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent replacement, improvement and so on, should be included in the present invention's
Within protection domain.
Claims (2)
1. fastening bolt surface smooth treatment technique, it is characterised in that comprise the following steps：
(1) sandblasting：Abrasive material selects iron-sand, and particle diameter 0.3mm, is sprayed using 0.3mm abrasive materials, and injection pressure is 0.92-
0.95MPa, nozzle keep the distance of 100mm, the angle of injection direction and fastening bolt surface normal to fastening bolt surface
Control is at 65 °；
(2) it is chemically treated：Fastening bolt is put into the solution of potassium pyrophosphate, sodium citrate, prodan and water mixed preparing
Soak 30min；
(3) first wash：Fastening bolt surface is rinsed with giant tank 5-8 times；
(4) the pre-heat treatment：Fastening bolt after washing is preheated to 480 DEG C, 40min is kept the temperature, then with 10 DEG C/min's
Speed is reduced to 140 DEG C, keeps the temperature 120min；
(5) pickling processes：Fastening bolt is cooled to 40 DEG C, then carries out pickling processes, time of processing is 0.5min, pickling
Solution is made of following component by weight：12 parts of HF, 11 parts of HNO3,100 parts of H2O；
(6) it is zinc-plated：Fastening bolt made from step (7) is put into galvanized bath in 2min, plating solution is cyanide electroplate liquid；
(7) second wash：Fastening bolt surface is rinsed with giant tank 8-10 times；
(8) dry.
2. fastening bolt surface smooth treatment technique according to claim 1, it is characterised in that burnt in the step (2)
Potassium phosphate, sodium citrate, prodan and water press 1:1:1:200 mass ratio is configured to solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228739.8A CN107955957A (en) | 2017-11-29 | 2017-11-29 | Fastening bolt surface smooth treatment technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228739.8A CN107955957A (en) | 2017-11-29 | 2017-11-29 | Fastening bolt surface smooth treatment technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107955957A true CN107955957A (en) | 2018-04-24 |
Family
ID=61962512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711228739.8A Pending CN107955957A (en) | 2017-11-29 | 2017-11-29 | Fastening bolt surface smooth treatment technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107955957A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109295485A (en) * | 2018-09-28 | 2019-02-01 | 江苏永昊高强度螺栓有限公司 | A kind of electroplating technology of high-strength bolt |
| CN110938843A (en) * | 2019-12-10 | 2020-03-31 | 隆昌山川精密焊管有限责任公司 | Large stamping part galvanizing process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11124690A (en) * | 1997-10-17 | 1999-05-11 | Nitto Seiko Co Ltd | Plating treatment of drill screw |
| CN202560778U (en) * | 2012-05-11 | 2012-11-28 | 成都乐天塑料有限公司 | Anti-locking fastener |
| CN106048682A (en) * | 2016-08-08 | 2016-10-26 | 常熟市常力紧固件有限公司 | Production technology of corrosion-resistant bolt for automobile transmission system |
| CN106826568A (en) * | 2016-12-22 | 2017-06-13 | 当涂县宏宇金属炉料有限责任公司 | A kind of copper alloy surface handling process |
-
2017
- 2017-11-29 CN CN201711228739.8A patent/CN107955957A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11124690A (en) * | 1997-10-17 | 1999-05-11 | Nitto Seiko Co Ltd | Plating treatment of drill screw |
| CN202560778U (en) * | 2012-05-11 | 2012-11-28 | 成都乐天塑料有限公司 | Anti-locking fastener |
| CN106048682A (en) * | 2016-08-08 | 2016-10-26 | 常熟市常力紧固件有限公司 | Production technology of corrosion-resistant bolt for automobile transmission system |
| CN106826568A (en) * | 2016-12-22 | 2017-06-13 | 当涂县宏宇金属炉料有限责任公司 | A kind of copper alloy surface handling process |
Non-Patent Citations (1)
| Title |
|---|
| 张允诚 等，: "《电镀手册 第3版》", 31 January 2007, 国防工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109295485A (en) * | 2018-09-28 | 2019-02-01 | 江苏永昊高强度螺栓有限公司 | A kind of electroplating technology of high-strength bolt |
| CN110938843A (en) * | 2019-12-10 | 2020-03-31 | 隆昌山川精密焊管有限责任公司 | Large stamping part galvanizing process |
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Application publication date: 20180424 |
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